To calculate the time it takes for the lorry to travel a distance of 52.5 km at an average speed of 15 km/h, you can use the formula:
\[ \text{Time} = \frac{\text{Distance}}{\text{Speed}} \]
Substituting the given values:
\[ \text{Time} = \frac{52.5 \text{ km}}{15 \text{ km/h}} \]
Calculating this gives:
\[ \text{Time} = 3.5 \text{ hours} \]
So, it will take the lorry 3.5 hours to travel a distance of 52.5 km.